I'm not a PK (Hell, I don't even play this game anymore). The thing is that all these "PK limit" suggestions can be easily abusable. Gauvaran's suggestion has a huge hole in it - factions. Since factions do "Bam, Bewm, Tra-ta-ta-ta-ta, bang" all day in hope of something awesome happening when eliminating another faction's members, alot of kills possibly would be tagged as innocent. Then there's this revenge thing - I've had instances where I got killed while I have no gear other than a BB gun to farm the stupid amounts of XP you can get from molerats. Obviously what I do, is I take some piece of armor, a hunting rifle or something along those lines, get rid of the bastard that took my farming grounds until he stops coming back. It's just not worth the changes, it would be a pain in the rear to do anything player killing related that the wasteland has to offer. It would feel just way too game-y.